Improvement in machines for dressing- millstones



tating the cutting or dressing of millstones by means direction ofthe cut can thereby be regulated.

A lowthe guide B to be applied toeither side, for cut- JOHN HINE, or 'ooeK @anni @Mire ERMOUTH, ENGLAND.

Letters Patent No. 95,901, lated Octobm` 19, 1869.

IMPROVEMENT IN MACHINES FOR DRESSING MILLSTONBS.

' l m The Schedule referred to in these Letters Patent and making part of the same.

HOW-

Be it known that I, J oHN HINE, of Cockerrnouth, in the county of Cumberland, England, have invented a new and useful Improvement in Apparatus for Gutting and Dressing Millstones; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

Figure l represents a plan or topview of my improved stone-c-u-tting and dressing machine'.

Figure 2 is a vertical section of the same, taken on the plane of the line a: x, Eg. l.

Figure 3 is a plan view of a modification of the same.

Figure LLis a vertical section of said modification.

Figure 5 is a side view, paitlyin section, ofthe diamond-holder.

Figure 6 is a bottom view of the same. Similar letters-of reference indicate corresponding parts.

My invention relates to a new apparatus for faciliof diamond or other hard stones or cutters, and consists in a novel arrangement and construction of parts for producing an adjustable and eective apparatus.

A, in the drawing, represents a bar or plate pivoted to the centre of a circular disk, C, which is bolted or otherwise fixed to the eye or centre of the millstone D to be dressed.

The bar A-is slottedy as seen, and is provided with a projecting lip, a, on the under side, which ts against the bevelled edge of the disk G, as shown.

To the bar A is pivoted a hand-lever, E, by the aid of which a sliding-carriage, F, containing the diamond or other cutter, can, be moved backward and forward.

B is'an adjustable slotted plate or frame, serving as a guide, along which the cutter-block F is traversed for the purpose of producing acut, said block moving in a dovetailed slot formed in ,the guide B.

This guide B is connected to the radial arm A, by being hung upon dovetailed lugs,` b, projecting from a plate, J, that is pivoted to the under side of the plate A.

The plate J can-be turned on it pivot, n, at'will, so as to give the guide B any suitable position. j The Lngs b project from both sides of the plate J, to alting to the right or left.

The guide B may also be xed rigidly in any desired position, with regard to the radial arm- A.

The hand-lever E is provided with a longitudinal .0, and

but one, for the slot, in which works a pin, c, projecting from the blockl F, so as to permit of the latter being freely traversed along the guide B when the lever E is swung on its pivot. y

After making a cut, the cutting-tool is laterally shifted, for the purpose of making another cut, b y partially rotating the bar A round the plate O, in the fol-l lowing manner:

Around the circumference of the disk or plate C are formed projecting pins or teeth, d, vplaced at equal distances apart. A

Into these gears a worm-screw, H, hung upon the inner' part of the arm A, and preferably contained in a box, H', carried by said arm.

This worin has one or more ratchet-wheels, e, formed on it, preferably at either end.

Into the ratchet-wheels, engage pawls fj', .that are connected with a sliding rod, I, and caused to operate the ratchets for the purpose of rotating the worm.

'Ihe en'd of the rod I has a projecting-pin, g, that works in a cam-groove, formed in a disk, L, pivoted on the hand-lever E, with which it moves, so that at each stroke or partial rvolution of the hand-lever E on its fulcrum for making a' cut, the pawls, abete mentioned, are caused to act on their ratchets and partially rotate the same, together with the worin. on

Which the ratchets are formed, which, gearing withthe pins a, as before mentioned, rotates the barA the 'required distance for making another cut.

As the guide B is rigidly connected to the bar A, as before described, it vwill beadvanced or rotated around the disk C, carrying with it the cutter-blockwhich is thus transferred to stone after each cut.

A small crank-shaft, N,

a fresh portion of the carrying a pinion, h, that meshes into a pinion, t, on the' boom-shaft, arranged on the plate A, for the purpose of allowing the plate A and its appendages to be turned without the use of the ratchet-wheels, and without requiring to operate the hand-lever E.

The apparatus may thereby be rotated on the disk quickly transferred to any position on the stone desired.

Instead of causing the cutter-block F to work in a guide, B, and so produce straight cuts, the guide may -be dispensed with, the cutter-block F being fixed in any suitable position on the hand-lever E, so asA to produce cuts curved to a circle, of which the fulcrum of the hand-lever E is the centre.

Figs. 3 and 4 illustratev a device adapted to the production of curved cuts; j

In either case, several diamond or other cutters may be mounted in the same cutting-block F,'instead of purpose of making a number of cuts at each stroke ofthe lever E, if required.4

Instead of operating the lever E by manual power."

as described, it. may be driven by steam or other power, transmitted in snitablemanner to the block F and bar I; a jointed rod, O, connecting the block F and lever E with' a central crank-shaft, P, being one form of applying the power of an engine.

The diamond j is set in a holder, M, which is itted vertically into the block F, and secured therein by suitable set-screws or otherwise. This lholder is, as shown in igs. 5 and 6, in form of a cylindrical bar,

whose lower e'nd is made in forni of a truncated cone.`

This cone is split by two cross-cuts in its base, as shown in iig. 6, and at the point of intersection of these cross-cuts the diamond is inserted. The diamond is thus held between the four segments ofthe cone.

' Around these is placed a collar, l, which is forced down by a nut, m, screwed upon the shank. The colv lar serves, therefore, to clamp the segments together, and to retain the diamond in place.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patentf- 1. The guidev B, fastened to the plate J, which is me, this 6th day of November, 1868.

pivoted to the radial arm A, substantially as described, so that the position of the guide can be varied atwill, as specifi ed.\-

2. The lever E, pivoted to the radial arm, to move the cutter-block and the ratchets, which impart intermittent rotary motion to the entire apparatus, as specified.

3. The radial arm A, toothed disk G, and worm H, in combination with the lover E, ratchet-bar I, cutterblock F, and holder M, all arranged and operating substantially as herein shown and described.

' 4. The diamond-holder M, having the split conica-I',

end, the lcollar l', and nut m, all arranged as described,

y to clamp the diamond between the segments of the cone, as specified.

The' above specification of my invention signed by JOHN d EINE,

Vifitnesses JAMES DAISH, v Chancery Lanze, W. G. E. STAINNOCK,l

London. 

